Hector yon bayee



(N0 Model.)

H. VON BAYER.

REAUTI NG TRUSS.

No; 245,034. PatentedAug. 2, 1881.

ll YQ )IKIKII' Wine-936s Inventor.-

UNITED STATES PATENT OFFICE.

HECTOR VON BAYER, OF WASHINGTON, DISTRICT OF COLUMBIA.

REACTING TRUSS.

SPECIFICATION forming part of Letters Patent No. 245,034, dated August2, 1881.

Application filed December 22, 1880. (No model.)

To all whom it may concern:

Be it known that I, HEGTOR VON BAYER, a citizen-of the United States,residing at Washington, in the District of Columbia, have in vented anew System of Trusses for Bridges, which I call Reacting Trusses, ofwhich the following is a description.

An ordinary truss-bridge acts upon the supports (the abutments) in avertical direction, or, in other words, the resulting force upon theabutment is solely the weight of the truss with its load. Arch andsuspension bridges act upon the abutments in an oblique direction, theresulting force uponthe abutments being the weight of the bridge withits load, combined withlateral strains proceeding from the nature ofconstruction.

system of struts beside the ties.

The object of my invention is to economize material and labor in theconstruction of bridges, retaining the necessary strength and safetyrequired.

Figure 1 is the vertical View of a reacting truss Fig. 2, thecorresponding horizontal .view; Fig. 3, the end view of the same. Fig.

4 exhibits the principle and direction of forces existing in thereacting truss. Fig. 5 is a de tail showing the suspension of thecross-beams from the ties.

The principal parts in the construction of the reacting truss are thepillars P,'the ties (braces) t, and the chord L.

The chord is joined to the pillars some height above their support onthe but-ments by means of trunnions, and keeps the pillars at a fixeddistance apart.

The weightW upon the truss, Fig. 4, is borne solely by the ties, so thatin no case does the said weight come upon the chord. (See Fig. 5.) Saidweight causes in the ties a tensile strain, a, (a.) This strain a (a)acts upon the pillar to which the ties are secured as a twofold strain,compressive, c, (0,) and bending, b, (b.) The compressive strain 0 (0)acts longitudinally upon the pillar, and through it upon the abutment A,(A.) The bending strain 1) (b) again is divided on account of thefulcrum F, forming at the point where the chord and pillar join into acompressive strain, 6, (e,) upon the chord, and a lateral strain, Z,(l,) at the lower end of the pillar into the abutment. The lateralstrain 1 (l) and the compressive strain 0, (0,) both acting at the samepoint of the pillar, will, joined together, result in the force R (R)upon the abutment. From'the foregoing it is evident, with a sufficientlystrong ordinary abutment and with all parts of the construction computedas to their proper strength, that the reacting truss may take the placeof any other bridge'construction, attaining the same safety as theothers at a less expenditure of material and labor.

Having fully described my invention, What I desire to claim and secureby Letters Patent 1s- A bridge composed of pillars, ties suspendedtherefrom, and a compression-chord arranged between the pillars andconnected thereto above their lower ends, whereby the resulting strainsare converted into a thrust upon the abutments, substantially as setforth;

HECTOR VON BAYER.

